Mobility Strategy for VoNR in Switch Boundary Scenario

With the gradual improvement of 5G technology and the evolution of network deployment, 5G voice solutions will also evolve from EPS Fallback to VoNR. However, in the early stage of VoNR commercial deployment, due to immature network optimization, the VoNR function can only be enabled in some areas, and EPS Fallback is still used in other areas. At this time, there is a phenomenon that the continuity of voice services cannot be guaranteed through the handover between the VoNR function switch on and the VoNR function switch off boundary area. This article mainly introduces the problems of the VoNR handover at switch boundary area, as well as several existing solutions. Then proposes a solution that does not need to transform the existing network and only needs to optimize the handover parameters. Verification has been made through an experimental of the existing network, which confirmed that this method can effectively guarantee the continuity of voice service experience in the VoNR function switch boundary area.